USB charger base



FIG. 1 is a perspective view of a USB charger base, showing my new design;

FIG. 2 is a bottom perspective view for the USB charger base;

FIG. 3 is a top plan view of the USB charger base;

FIG. 4 is a bottom plan view of the USB charger base;

FIG. 5 is a left side view of the USB charger base;

FIG. 6 is a right side view for the USB charger base;

FIG. 7 is a rear view of the USB charger base; and,

FIG. 8 is a front view of the USB charger base. 

CLAIM The ornamental design for a USB charger base, as shown and described. 